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A snapshot of the Flex Builder 3 console

Figure 2 shows a snapshot of the console window in the Flex Builder 3 IDE when the above procedure was executed in debug mode.

The three lines of text beginning with the word Activated were produced when the Flash Player gained operating system focus. The three lines oftext beginning with the word Deactivated were produced when the Flash Player lost operating system focus.

The currentTarget and target properties of the Event object

For an explanation of the currentTarget and the target properties shown in Figure 2, see the excellent article titled Understanding the AS3 Event Flow by Jody Hall. As you will see in the next sample program, this information can be used to identify the component thatdispatched the event.

Will discuss in fragments

I will explain the code for ActivateEvent01 in fragments. A complete listing of the class file is provided in Listing 15near the end of the lesson.

Beginning of Driver class for ActivateEvent01

Listing 2 shows the beginning of the Driver class for ActivateEvent01 .

Beginning of driver class for activateevent01.

package CustomClasses{ import flash.events.Event;import mx.containers.VBox; import mx.controls.Label;public class Driver extends VBox{public function Driver(){ setStyle("borderStyle","inset");setStyle("borderColor",0xFF0000); height=100;var label:Label = new Label(); label.text = "Click browser in debug mode"label.setStyle("color",0xFFFF00); addChild(label);addEventListener(Event.ACTIVATE,activateHandler);addEventListener(Event.DEACTIVATE, deActivateHandler);}//end constructor

Extends the VBox class

The entire program is written in the Driver class and illustrates the activate and deactivate events of the EventDispatcher class.

This class extends the VBox class, so an object of this class is a VBox object.

Register event listeners

The first statement beginning with addEventListener registers an event listener on the VBox object causing it to execute the method named activateHandler when the Flash Player gains operating system focus and becomes the activeprogram.

The second statement beginning with addEventListener registers an event listener on the VBox causing it to execute the deActivateHandler method when the Flash Player loses operating system focus and is no longer the active program.

The event handler methods

The two event handler methods are shown in Listing 3.

The event handler methods.

private function activateHandler(event:Event):void{ trace("\nActivated\ncurrentTarget = "+ event.currentTarget + "\ntarget = "+ event.target); }//end activateHandler//-----------------------------=-------------------//private function deActivateHandler(event:Event):void{ trace("\nDeactivated\ncurrentTarget = "+ event.currentTarget + "\ntarget = "+ event.target); }//end deActivateHandler}//end class }//end package

Output produced by the trace function

When the methods are executed in debug mode, the call to the trace function extracts and displays property values from the incoming Event object.

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
Berger describes sociologists as concerned with
Mueller Reply
what is hormones?
Wellington
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Source:  OpenStax, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
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